javascript - 如何在jQuery中检查null对象(How to check null objects in jQuery)

Question

I'm using jQuery and I want to check the existence of an element in my page.

(我正在使用jQuery，我想检查页面中是否存在元素。)

I have written following code, but it's not working:

(我写了下面的代码，但它不起作用：)

if($("#btext" + i) != null) {
    //alert($("#btext" + i).text());
    $("#btext" + i).text("Branch " + i);
}

How do I check the existence of the element?

(如何检查元素的存在？)

  ask by Prashant translate from so

Answer 1

Check the jQuery FAQ ...

(查看jQuery FAQ ...)

You can use the length property of the jQuery collection returned by your selector:

(您可以使用选择器返回的jQuery集合的length属性：)

if ( $('#myDiv').length ){}